NC MX5 Miata: Are Individual Throttle Bodies Worth It?

The NC Miata with the Duratec 2.0 motor is an absolute joy to drive, tune and modify. With the top down the sound of ITBs is absolutely intoxicating. We all know that. The question that we must answer is: How Much Power do ITBs add?

Thankfully we have Stanley’s car on our dyno to tune and dial in his BBR225 ITBs the Stratified way. So let’s see if these give you more than style points and eargasms.

Enjoy!

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MX5 Miata Tuning

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Enjoy!

0:00 Intro
3:38 Dyno & Tune
4:24 Results

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#Miata #MX5 #NCMiata #ITBs #stratifiedtuned #stratifiedauto

[WoodEe-zqqv]

ITBs don't make power, they make music.

[smiles]

I love how you actually provide quality feedback for almost every comment. That shows commitment and confidence.

[turbocoupe]

i run 8 ITBs on a 452 cu.in. Ford FE. I use a Megasquirt 2 in ITB mode. ITB mode is a blend between Alpha-N and SD. It's very hard to tune ITBs in solely Alpha-N or SD. both have compromises. Typically, ITBs produce more torque than a single plane because of the ram effect. Usually the trumpets are too short to produce a tuned intake effect. The don't always make more HP. A well tuned single plane will make similar horsepower, but the part throttle function idle, and throttle response is a world of difference.

[fernandogutierrez]

I used to had an NC. Header 4-1, decatted only a muffler mounted. Adjustable dampers front and rear. Light wheels and sticky tires. God, what an incredible machine. I could not mount the ITB's cause I sold it. But I'd like to have another one.

[AnglUki]

Throttle response is a big part of ITBs too. The air doesn't need to take as long to reach your engine. Yeah it moves at the speed of sound, but that's still milliseconds.

[altoticket]

Properly sized (long tubes) ITBs + Lightweight Flywheel is the way to go

[chaoticpuppet]

That's neat. Like the originality.
There's a company that also does superchargers. I think it's vr racing.

[shyneus]

Honestly I've been looking at them just because they sound sick

[ChurchAutoTest]

Cool stuff. Question. How do intake temps look on the road with the hood closed vs. the stock manifold and a typical intake? ITBs always look awesome on the dyno but without cold air ducting sometimes road performance can take a hit.

[simoneamodei]

Power increase depends on runner geometry and not where you place the butterfly. I think it's easy to understand that when you floor the pedal the flow is parallel to he butterfly so that's like no butterfly being there. You even have less restriction with a well designed single throttle (less pumping losses). The only reason of ITBs is throttle response because less volume to fill on transient throttle (noticeable only at low rpm let's be honest) and more sound with open trumpets (not good for power apart from rare extreme NA setups). Remember itbs were used in racing only to make the car more driveable with extreme cam durations not to increase top end power.

[markufoto]

Looks like OZ Racing wheels, do you remember or know which style they were? They look excellent!

[mr.adventure]

Makes me wonder how much more a 2.5L swap with cams and 11.5:1 compression ratio pistons would make.

[shonsweet]

Air intake not getting cold air when hood is closed. I see issues later on with it.

[yOnKiNaToR]

My dyno curve is much different than this setup with my BBR ITBs. I have a lot of low end from 2-4k rpm. Max tq is around 3500 rpm. Then the torque curve dies off after that. Im curious, can you share your VVT settings? Im trying to understand why our curves are so different.

[MR-]

Stratified do you think you’ll ever swap a 2.5 Fusion engine in a Miata & offer tuning for turbocharged 2.5?

[megajohntopunishenslave]

Question: in the install I see the old filter air box with maf sensor . Is this used still as part of the intake system or can it be removed. Clearing up the engine bay 😊

[jandsmx]

Hi, great video, thanks for posting. Can you please let us know what those peak numbers for BHP and TORQUE were?

[bombardierboerboels]

Does it not need a cam for best results from itb

[yOnKiNaToR]

Did you have issues with idle tuning? My ITB setup on ECUTEK runs horribly on the initial warmup phase and it seems to die when the AC compressor runs or when i put load on the power steering pump.

[ThatHondaChannel]

Isn't it better, and I mean much better to tune ITBs via TPS than off a MAP sensor. Serious question.